Dryocoetes autographus

Bark beetle Dryocoetes autographus

This member of the bark beetle family colonizes thicker trunk sections of dying trees. Primarily, however, it prefers felled or broken trunks lying on moist ground and often inhabits stumps, too. The adult is a brown beetle, 3-4 mm long. Larvae excavate gallery, which is normally single-branched, with larval tunnels on both sides. In case of massive attack the feeding galleries are intersected. Its more common in higher altitudes. The relative species Dryocoetes hectographus can also be found on Norway spruce.

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Galleries under the bark. The adult is a brown beetle, 3-4 mm long. Larvae excavate gallery, which is normally single-branched, with larval tunnels on both sides.

Tree Species: Spruce

Part of a plant- attacked: Tree trunk

Pest significance: Less harmful

Pest Category: Insects

Invasive Species: No

Present in EU: Yes

Pest group: Insect

Depth of damages: Bark, Under bark only, Up to 0,5 cm depth

The extent of damage: Whole trunk

Prevalence in Europe: Common

Damaged products: Firewood, Fresh timber logs (water still in the sapwood)

Roundwood size: Diameter 50+, Diameter from 10 up to 50 cm, Diameter up to 10 cm